Fix virtual/override/final usage in Source/modules/.

Source/modules/webgl/WebGLContextObject.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 22 matching lines @@
 }
 
 namespace blink {
 
 class WebGLRenderingContextBase;
 
 // WebGLContextObject the base class for objects that are owned by a specific
 // WebGLRenderingContextBase.
 class WebGLContextObject : public WebGLObject {
 public:
-    virtual ~WebGLContextObject();
+    ~WebGLContextObject() override;
 
     WebGLRenderingContextBase* context() const { return m_context; }
 
-    virtual bool validate(const WebGLContextGroup*, const WebGLRenderingContextBase* context) const override final
+    bool validate(const WebGLContextGroup*, const WebGLRenderingContextBase* context) const final
     {
         return context == m_context;
     }
 
     void detachContext();
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     explicit WebGLContextObject(WebGLRenderingContextBase*);
 
-    virtual bool hasGroupOrContext() const override final
+    bool hasGroupOrContext() const final
     {
         return m_context;
     }
 
-    virtual WebGraphicsContext3D* getAWebGraphicsContext3D() const override final;
+    WebGraphicsContext3D* getAWebGraphicsContext3D() const final;
 
 private:
     RawPtrWillBeMember<WebGLRenderingContextBase> m_context;
 };
 
 } // namespace blink
 
 #endif // WebGLContextObject_h